diff --git a/service/Android.bp b/service/Android.bp
index 567c079..fd3d4a3 100644
--- a/service/Android.bp
+++ b/service/Android.bp
@@ -90,7 +90,6 @@
     static_libs: [
         "libnet_utils_device_common_bpfjni",
         "libnet_utils_device_common_bpfutils",
-        "libnet_utils_device_common_timerfdjni",
     ],
     shared_libs: [
         "liblog",
@@ -126,6 +125,7 @@
         "libmodules-utils-build",
         "libnetjniutils",
         "libnet_utils_device_common_bpfjni",
+        "libnet_utils_device_common_timerfdjni",
         "netd_aidl_interface-lateststable-ndk",
     ],
     shared_libs: [
diff --git a/service/jni/onload.cpp b/service/jni/onload.cpp
index bb70d4f..8e01260 100644
--- a/service/jni/onload.cpp
+++ b/service/jni/onload.cpp
@@ -26,6 +26,8 @@
 int register_android_server_net_NetworkStatsFactory(JNIEnv* env);
 int register_android_server_net_NetworkStatsService(JNIEnv* env);
 int register_com_android_server_ServiceManagerWrapper(JNIEnv* env);
+int register_com_android_net_module_util_TimerFdUtils(JNIEnv *env,
+                                                      char const *class_name);
 
 extern "C" jint JNI_OnLoad(JavaVM* vm, void*) {
     JNIEnv *env;
@@ -56,6 +58,12 @@
         }
     }
 
+    if (register_com_android_net_module_util_TimerFdUtils(
+            env, "android/net/connectivity/com/android/net/module/util/"
+                 "TimerFdUtils") < 0) {
+      return JNI_ERR;
+    }
+
     return JNI_VERSION_1_6;
 }
 
diff --git a/staticlibs/Android.bp b/staticlibs/Android.bp
index c29004c..fa17b23 100644
--- a/staticlibs/Android.bp
+++ b/staticlibs/Android.bp
@@ -32,6 +32,8 @@
     default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
+// This library shouldn't be used anymore (no class should be added), and per-user libraries like
+// net-utils-service-connectivity or net-utils-framework-wifi should be used instead.
 java_library {
     name: "net-utils-device-common",
     srcs: [
diff --git a/staticlibs/device/com/android/net/module/util/TimerFdUtils.java b/staticlibs/device/com/android/net/module/util/TimerFdUtils.java
new file mode 100644
index 0000000..310dbc9
--- /dev/null
+++ b/staticlibs/device/com/android/net/module/util/TimerFdUtils.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.net.module.util;
+
+import android.os.Process;
+import android.util.Log;
+
+import java.io.IOException;
+
+/**
+ * Contains mostly timerfd functionality.
+ */
+public class TimerFdUtils {
+    static {
+        if (Process.myUid() == Process.SYSTEM_UID) {
+            // This library is part of service-connectivity.jar when in the system server,
+            // so libservice-connectivity.so is the library to load.
+            System.loadLibrary("service-connectivity");
+        } else {
+            System.loadLibrary(JniUtil.getJniLibraryName(TimerFdUtils.class.getPackage()));
+        }
+    }
+
+    private static final String TAG = TimerFdUtils.class.getSimpleName();
+
+    /**
+     * Create a timerfd.
+     *
+     * @throws IOException if the timerfd creation is failed.
+     */
+    private static native int createTimerFd() throws IOException;
+
+    /**
+     * Set given time to the timerfd.
+     *
+     * @param timeMs target time
+     * @throws IOException if setting expiration time is failed.
+     */
+    private static native void setTime(int fd, long timeMs) throws IOException;
+
+    /**
+     * Create a timerfd
+     */
+    static int createTimerFileDescriptor() {
+        try {
+            return createTimerFd();
+        } catch (IOException e) {
+            Log.e(TAG, "createTimerFd failed", e);
+            return -1;
+        }
+    }
+
+    /**
+     * Set expiration time to timerfd
+     */
+    static boolean setExpirationTime(int id, long expirationTimeMs) {
+        try {
+            setTime(id, expirationTimeMs);
+        } catch (IOException e) {
+            Log.e(TAG, "setExpirationTime failed", e);
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/tests/cts/net/src/android/net/cts/ApfIntegrationTest.kt b/tests/cts/net/src/android/net/cts/ApfIntegrationTest.kt
index 9ac2c67..8e77b5d 100644
--- a/tests/cts/net/src/android/net/cts/ApfIntegrationTest.kt
+++ b/tests/cts/net/src/android/net/cts/ApfIntegrationTest.kt
@@ -19,6 +19,7 @@
 
 package android.net.cts
 
+import android.Manifest.permission.WRITE_ALLOWLISTED_DEVICE_CONFIG
 import android.Manifest.permission.WRITE_DEVICE_CONFIG
 import android.content.pm.PackageManager.FEATURE_WIFI
 import android.net.ConnectivityManager
@@ -165,7 +166,7 @@
             // created.
             // APF adb cmds are only implemented in ApfFilter.java. Enable experiment to prevent
             // LegacyApfFilter.java from being used.
-            runAsShell(WRITE_DEVICE_CONFIG) {
+            runAsShell(WRITE_DEVICE_CONFIG, WRITE_ALLOWLISTED_DEVICE_CONFIG) {
                 DeviceConfig.setProperty(
                         NAMESPACE_CONNECTIVITY,
                         APF_NEW_RA_FILTER_VERSION,
diff --git a/tests/cts/tethering/src/android/tethering/cts/TetheringManagerTest.java b/tests/cts/tethering/src/android/tethering/cts/TetheringManagerTest.java
index 47d444f..b294d63 100644
--- a/tests/cts/tethering/src/android/tethering/cts/TetheringManagerTest.java
+++ b/tests/cts/tethering/src/android/tethering/cts/TetheringManagerTest.java
@@ -77,6 +77,7 @@
 import android.telephony.SubscriptionManager;
 import android.telephony.TelephonyManager;
 
+import androidx.annotation.NonNull;
 import androidx.test.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
 
@@ -225,19 +226,23 @@
 
     }
 
-    @Test
-    public void testTetheringRequest() {
-        SoftApConfiguration softApConfiguration;
+    private SoftApConfiguration createSoftApConfiguration(@NonNull String ssid) {
+        SoftApConfiguration config;
         if (SdkLevel.isAtLeastT()) {
-            softApConfiguration = new SoftApConfiguration.Builder()
-                    .setWifiSsid(WifiSsid.fromBytes(
-                            "This is an SSID!".getBytes(StandardCharsets.UTF_8)))
+            config = new SoftApConfiguration.Builder()
+                    .setWifiSsid(WifiSsid.fromBytes(ssid.getBytes(StandardCharsets.UTF_8)))
                     .build();
         } else {
-            softApConfiguration = new SoftApConfiguration.Builder()
-                    .setSsid("This is an SSID!")
+            config = new SoftApConfiguration.Builder()
+                    .setSsid(ssid)
                     .build();
         }
+        return config;
+    }
+
+    @Test
+    public void testTetheringRequest() {
+        SoftApConfiguration softApConfiguration = createSoftApConfiguration("SSID");
         final TetheringRequest tr = new TetheringRequest.Builder(TETHERING_WIFI)
                 .setSoftApConfiguration(softApConfiguration)
                 .build();
@@ -302,17 +307,7 @@
 
     @Test
     public void testTetheringRequestSetSoftApConfigurationFailsWhenNotWifi() {
-        final SoftApConfiguration softApConfiguration;
-        if (SdkLevel.isAtLeastT()) {
-            softApConfiguration = new SoftApConfiguration.Builder()
-                    .setWifiSsid(WifiSsid.fromBytes(
-                            "This is an SSID!".getBytes(StandardCharsets.UTF_8)))
-                    .build();
-        } else {
-            softApConfiguration = new SoftApConfiguration.Builder()
-                    .setSsid("This is an SSID!")
-                    .build();
-        }
+        final SoftApConfiguration softApConfiguration = createSoftApConfiguration("SSID");
         for (int type : List.of(TETHERING_USB, TETHERING_BLUETOOTH, TETHERING_WIFI_P2P,
                 TETHERING_NCM, TETHERING_ETHERNET)) {
             try {
@@ -326,17 +321,7 @@
 
     @Test
     public void testTetheringRequestParcelable() {
-        final SoftApConfiguration softApConfiguration;
-        if (SdkLevel.isAtLeastT()) {
-            softApConfiguration = new SoftApConfiguration.Builder()
-                    .setWifiSsid(WifiSsid.fromBytes(
-                            "This is an SSID!".getBytes(StandardCharsets.UTF_8)))
-                    .build();
-        } else {
-            softApConfiguration = new SoftApConfiguration.Builder()
-                    .setSsid("This is an SSID!")
-                    .build();
-        }
+        final SoftApConfiguration softApConfiguration = createSoftApConfiguration("SSID");
         final LinkAddress localAddr = new LinkAddress("192.168.24.5/24");
         final LinkAddress clientAddr = new LinkAddress("192.168.24.100/24");
         final TetheringRequest withConfig = new TetheringRequest.Builder(TETHERING_WIFI)
@@ -363,9 +348,7 @@
             tetherEventCallback.assumeWifiTetheringSupported(mContext);
             tetherEventCallback.expectNoTetheringActive();
 
-            SoftApConfiguration softApConfig = new SoftApConfiguration.Builder()
-                    .setWifiSsid(WifiSsid.fromBytes("This is an SSID!"
-                            .getBytes(StandardCharsets.UTF_8))).build();
+            SoftApConfiguration softApConfig = createSoftApConfiguration("SSID");
             final TetheringInterface tetheredIface =
                     mCtsTetheringUtils.startWifiTethering(tetherEventCallback, softApConfig);
 
diff --git a/tests/unit/jni/android_net_frameworktests_util/onload.cpp b/tests/unit/jni/android_net_frameworktests_util/onload.cpp
index 06a3986..a0ce4f8 100644
--- a/tests/unit/jni/android_net_frameworktests_util/onload.cpp
+++ b/tests/unit/jni/android_net_frameworktests_util/onload.cpp
@@ -24,6 +24,8 @@
 
 int register_com_android_net_module_util_BpfMap(JNIEnv* env, char const* class_name);
 int register_com_android_net_module_util_TcUtils(JNIEnv* env, char const* class_name);
+int register_com_android_net_module_util_TimerFdUtils(JNIEnv *env,
+                                                      char const *class_name);
 
 extern "C" jint JNI_OnLoad(JavaVM* vm, void*) {
     JNIEnv *env;
@@ -38,6 +40,10 @@
     if (register_com_android_net_module_util_TcUtils(env,
             "android/net/frameworktests/util/TcUtils") < 0) return JNI_ERR;
 
+    if (register_com_android_net_module_util_TimerFdUtils(
+            env, "android/net/frameworktests/util/TimerFdUtils") < 0)
+      return JNI_ERR;
+
     return JNI_VERSION_1_6;
 }